.page-template-page-thank-you{
    overflow: hidden;
}
.page-template-page-thank-you .thank-you{
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0;
}
.page-template-page-thank-you .thank-you{

}

.thank-you .glaz-form__content{
    text-align: center;
}